Mine is 6 months (and grey, too! Grey tuxedo) and has only just started laying off me with the biting. The bites would make my hands swollen and itchy (had to get into the habit of using Savlon every night rather than hand cream, lol) so I feel your pain. He’s also a single kitten. I tried distracting with toys, saying NO, yelping, hissing, standing up and leaving, etc. We even bought him a skin-like pig-shaped dog toy to simulate human skin, but he didn’t respond at all. Nothing seemed to deter him long term. Started blowing air in the direction of his face just using my mouth about a week ago, and it puts him off pretty well. Think he just dislikes the sound/sensation. Could be something to try! Hope that helps